Boat trailer roller unit



FIG. 1 is a perspective view of a boat trailer roller unit showing my new design, it being understood that broken lines are for illustrative purposes only and form no part of the claimed design;

FIG. 2 is a top plan view thereof;

FIG. 3 is an end elevation view thereof, the opposite end being a mirror image of that shown;

FIG. 4 is a side elevation view taken along line 4--4 of FIG. 2;

FIG. 5 is a side elevation view taken along line 5--5 of FIG. 2; and

FIG. 6 is bottom plan view thereof. 

The ornamental design for a boat trailer roller unit, as shown and described. 